I just bought my truck from an auto auction and have a bit of a drive to work. I am looking to improve my gas mileage and need some tips on how to do so. Next Friday I am having cat-back Flowmaster duel exhaust installed and I am also going to install a K&N Cool Air Intake. My main question is whether or not K&N is the best cool air intake I can put on it and what other type of modifications I can make to improve its mileage.